Sahih al Bukhari 80

Narrated Anas: Allah's Messenger (ﷺ) said, "From among the portents of the Hour are (the following):

-1. Religious knowledge will be taken away (by the death of Religious learned men).

-2. (Religious) ignorance will prevail.

-3. Drinking of Alcoholic drinks (will be very common).

-4. There will be prevalence of open illegal sexual intercourse

Sahih al Bukhari 80
Book 3, Hadith 22